This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A249394 #51 Aug 06 2021 01:57:29 %S A249394 4,5,13,53,8645 %N A249394 Numbers k such that the k-th ménage number is prime. %C A249394 This sequence is heuristically conjectured to grow doubly-exponentially. %C A249394 a(6) > 100000. - _Hans Havermann_, Jan 19 2019 %H A249394 Adam P. Goucher, <a href="https://cp4space.wordpress.com/2014/10/31/menage-primes/">Menage primes</a>, Complex Projective 4-Space. %e A249394 The only known ménage primes are M(4) = 2, M(5) = 13, M(13) = 775596313, M(53) = 567525075138663383127158192994765939404930668817780601409606090331861, and M(8645). %o A249394 (PARI) is(n)=ispseudoprime(round(2*n*exp(-2)*besselk(n, 2))) \\ _Charles R Greathouse IV_, Nov 10 2014 %Y A249394 By definition, the inverse image of A000040 under the function A000179. %Y A249394 The ménage primes themselves are given in A249510. %K A249394 nonn,hard %O A249394 1,1 %A A249394 _Adam P. Goucher_, Oct 30 2014 %E A249394 Example edited by _Hans Havermann_, Jan 19 2019